第一种:
<script language="javascript"type="text/javascript">
window.location.href="login.jsp?backurl="+window.location.href;
</script>
第二种:
<script language="javascript">
alert"返回");
window.history.back-1);
</script>
第三种:
<script language="javascript">
window.navigate"top.jsp");
</script>
第四种:
<script language="JavaScript">
self.location='top.htm';
</script>
第五种:
<script language="javascript">
alert"非法访问!");
top.location='xx.jsp';
</script>